Alterations to the LightAlterations to the Light

Alterations to the Light

Image unavailable in extracted textDue to developments in technology, the Montague Island Lighthouse was modified multiple times to improve its use as an AtoN.

<table cellspacing="0" cellpadding="0" style="margin-left:8.15pt; border-collapse:collapse"><tbody><tr style="height:22.55pt"><td rowspan="2" style="width:79.35pt; border-bottom:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-top:6.15pt; font-size:9pt"><span style="font-weight:bold; color:#ffffff">Date</span></p><p class="TableParagraph" style="margin-left:0pt; font-size:10pt"><span></span></p><p class="TableParagraph" style="margin-top:0.4pt; margin-left:0pt; font-size:9pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>1910</span></p></td><td style="width:150.2pt; vertical-align:top; background-color:#4c7ba8"><p class="TableParagraph" style="margin-top:6.15pt; margin-left:5.8pt; font-size:9pt"><span style="font-weight:bold; color:#ffffff">Alteration</span></p></td></tr><tr style="height:42.25pt"><td style="width:149.45pt; border-right:0.75pt solid #0b679b; border-left:0.75pt solid #0b679b; border-bottom:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:6.2pt; margin-left:4pt; line-height:97%; font-size:9pt"><span>55 mm Schmidt-Ford vaporised kerosene powered mantle installed. Intensity: 250,000 candlepower (cp)</span></p></td></tr><tr style="height:30.9pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-top:0.5pt; margin-left:0pt; font-size:8.5pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>13 April 1923</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:5.3pt; margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">New mantle installed.</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">Intensity: 357,000 cp</span></p></td></tr><tr style="height:56.4pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-left:0pt; font-size:10pt"><span></span></p><p class="TableParagraph" style="margin-top:0.05pt; margin-left:0pt; font-size:10pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>19 July 1926</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:3.05pt; margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">Roller pedestal removed. Mercury</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10pt"><span style="font-size:9pt">bath pedestal installed.</span></p><p class="TableParagraph" style="margin-top:0.05pt; margin-right:18.85pt; margin-left:4pt; line-height:97%; font-size:9pt"><span>Four of the original eight panels screened off – light now only produces a flashing light.</span></p></td></tr><tr style="height:67.75pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-left:0pt; font-size:10pt"><span></span></p><p class="TableParagraph" style="margin-top:0.55pt; margin-left:0pt; font-size:14.5pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>20 June 1969</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:3.95pt; margin-right:3.85pt; margin-left:4pt; line-height:97%; font-size:9pt"><span>Conversion to diesel electric operation – 1000 W Tungsten- halogen lamp installed.</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:9.8pt"><span style="font-size:9pt">Four optic panels (ex-Green Cape</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10pt"><span style="font-size:9pt">lighthouse) installed.</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">Intensity: 1,000,000 cp</span></p></td></tr><tr style="height:30.9pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-top:0.5pt; margin-left:0pt; font-size:8.5pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>14 Sept 1986</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:5.3pt; margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">First order lens turned off and</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">removed to the mainland.</span></p></td></tr><tr style="height:30.9pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-top:0.5pt; margin-left:0pt; font-size:8.5pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>28 Nov 1986</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:5.3pt; margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt">Solar-powered PRP-24 beacon</span></p><p class="TableParagraph" style="margin-left:4pt; line-height:10.15pt"><span style="font-size:9pt; letter-spacing:-0.2pt">installed. Lighthouse fully-automated.</span></p></td></tr><tr style="height:30.9pt"><td style="width:78.6pt; border:0.75pt solid #0b679b; vertical-align:top"><p class="TableParagraph" style="margin-top:0.5pt; margin-left:0pt; font-size:8.5pt"><span></span></p><p class="TableParagraph" style="margin-left:3.95pt; font-size:9pt"><span>6 April 2006</span></p></td><td style="width:149.45pt; border:0.75pt solid #0b679b; vertical-align:top; background-color:#eff9fe"><p class="TableParagraph" style="margin-top:5.55pt; margin-right:3.75pt; margin-left:4pt; line-height:97%; font-size:9pt"><span style="letter-spacing:-0.2pt">Solar-powered </span><span style="letter-spacing:-0.3pt">Vega </span><span style="letter-spacing:-0.2pt">VRB-25 beacon installed. Intensity: 132,736 cp</span></p></td></tr></tbody></table>

Image unavailable in extracted text

Figure 20. Evolution of Montague Island Lighthouse lens/

lanterns (Searle, 2013, pg. 209)